Toa DP-L2 User Manual v.2.00

OPERATING INSTRUCTIONS

DIGITAL AMBIENT
NOISE CONTROLLER

DP-L2

(Version 2.00)

Thank you for purchasing TOA's Digital Ambient Noise Controller.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

2

TABLE OF CONTENTS

1. SAFETY PRECAUTIONS ................................................................................ 3

2. GENERAL DESCRIPTION .............................................................................. 5

3. FEATURES ........................................................................................................... 5

4. HANDLING PRECAUTIONS ........................................................................... 5

5. NOMENCLATURE AND FUNCTIONS

Front .......................................................................................................................... 6

Rear ........................................................................................................................... 7

6. SETTINGS

6.1. Setting Operations and Setting Screens

6.1.1. Keys and knobs used in settings ............................................................. 8

6.1.2. On-screen indications .............................................................................. 9

6.2. Setting Flow Charts

6.2.1. System setting flow chart ...................................................................... 10

6.2.2. ALC function setting flow chart .............................................................. 11

6.2.3. ANC function setting flow chart .............................................................. 12

6.2.4. ALC and ANC functions ON/OFF settings ............................................. 13

6.2.5. INPUT LEVEL, OUTPUT LEVEL,

and ALC LEVEL indication selection ..................................................... 14

6.3. Setting Procedures .......................................................................................... 14

6.4. Key Lock Function Settings

6.4.1. Locking the keys .................................................................................... 21

6.4.2. Releasing the locked state ..................................................................... 21

6.5. Restoring Default Settings ............................................................................... 22

7. CONNECTIONS

7.1. Removable Terminal Plug Connection ............................................................ 23

7.2. Example 1: Input and Output Connections

(When Connecting to a Stereo Mixer's Outputs) .............................................. 24

7.3. Example 2: Input and Output Connections

(When Connecting to a BGM Player's Outputs) ............................................... 24

8. RACK MOUNTING ........................................................................................... 25

9. BLOCK DIAGRAM ........................................................................................... 26

10. RECORDING TABLE OF FUNCTION SETTINGS ................................. 27

11. SPECIFICATIONS ............................................................................................ 28

Accessories ............................................................................................................. 28

3

Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.

WARNING

1. SAFETY PRECAUTIONS

• Before installation or use, be sure to carefully read all the instructions in this section for correct and safe
operation.

• Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or
cautions regarding safety.

• After reading, keep this manual handy for future reference.

Safety Symbol and Message Conventions

Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.

When Installing the Unit

• Do not expose the unit to rain or an environment where it may be splashed by water or other liquids, as
doing so may result in fire or electric shock.

• Use the unit only with the voltage specified on the unit. Using a voltage higher than that which is specified
may result in fire or electric shock.

• Do not cut, kink, otherwise damage nor modify the power supply cord. In addition, avoid using the power
cord in close proximity to heaters, and never place heavy objects -- including the unit itself -- on the power
cord, as doing so may result in fire or electric shock.

• Since the unit is designed for in-door use, do not install it outdoors. When it gets wet with rain, there is a
danger of electric shock.

• Do not touch a plug during thunder and lightning, as this may result in electric shock.

When the Unit is in Use

• To prevent a fire or electric shock, never open nor remove the unit case as there are high voltage
components inside the unit. Refer all servicing to your nearest TOA dealer.

• Should the following irregularity be found during use, immediately switch off the power, disconnect the power
supply plug from the AC outlet and contact your nearest TOA dealer. Make no further attempt to operate the
unit in this condition as this may cause fire or electric shock.

· If you detect smoke or a strange smell coming from the unit.

· If water or any metallic object gets into the unit

· If the unit falls, or the unit case breaks

· If the power supply cord is damaged (exposure of the core, disconnection, etc.)

· If it is malfunctioning (no tone sounds.)

• Do not place cups, bowls, or other containers of liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire or electric shock.

• Do not insert nor drop metallic objects or flammable materials in the ventilation slots on the unit's sides and
rear, as this may result in fire or electric shock.

4

Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.

CAUTION

When Installing the Unit

• Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock.

• When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord
itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock.

• When moving the unit, be sure to remove its power supply cord from the wall outlet. Moving the unit with the
power cord connected to the outlet may cause damage to the power cord, resulting in fire or electric shock.
When removing the power cord, be sure to hold its plug to pull.

• Do not block the ventilation slots on the unit's sides and rear. Doing so may cause heat to build up inside the
unit and result in fire.

• Avoid installing the unit in humid or dusty locations, in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric
shock.

• Be sure to follow the instructions below when rack-mounting the unit. Failure to do so may cause a fire or
personal injury.

· Install the equipment rack on a stable, hard floor. Fix it with anchor bolts or take other arrangements to

prevent it from falling down.

· When connecting the unit's power cord to an AC outlet, use the AC outlet with current capacity allowable to

the unit.

• The socket-outlet shall be installed near the equipment and the plug shall be easily accessible.

Lors de l'installation de l'appareil

• La prise doit être installée à proximité de l'équipement et la fiche doit être facilement accessible.

When the Unit is in Use

• If dust accumulates on the power supply plug or in the wall AC outlet, a fire may result. Clean it periodically.
In addition, insert the plug in the wall outlet securely.

• Switch off the power, and unplug the power supply plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or more. Doing otherwise may cause a fire or electric shock.

5

2. GENERAL DESCRIPTION

TOA's DP-L2 is a 1U size* rack-mountable digital audio processor having an ambient noise control (ANC)
function which automatically adjusts output sounds in response to changes in ambient noise level. It also
features an automatic level control (ALC) function that automatically adjusts the input signal level to an
appropriate level.

*1U size: 44.5 mm (standard size)

3. FEATURES

• ANC function distinguishes between the unit's output sound and the ambient noise. (The unit's output sound
is not detected as noise.)

• Various types of microphones, including ceiling flush mounted, dynamic and condenser types, usable for
detecting ambient noise.

• Monitoring of sound collected via the ambient noise sensor microphone.

• Front-mounted LED meters for the input and output signal levels, and ALC and ANC levels.

• Easy setting of each function with the front-mounted LCD (liquid crystal display), keys and knobs.

4. HANDLING PRECAUTIONS

• The supplied power supply cord is designed for exclusive use with this unit. Never use it with other
equipment.

• Install the unit in locations where the temperature is between 0 and +40°C and the moisture is less than 90%
(no dew condensation must be formed).

• The DP-L2 is a precision audio component. To prevent failure, avoid locations where the unit may be
exposed to strong shocks or vibrations.

• To clean, be sure to first switch off the unit's power, then wipe with a dry cloth. When the unit gets very dirty,
use a cloth damped in a neutral cleanser. Never use benzene, thinner or chemically-treated cleaning cloth
because such volatile liquids could deform or discolor the unit.

• FCC Rules (CU version) and Class A ITE (CE version)

The CU version complies with Part 15 of the FCC Rules.

The CE version complies with Class A ITE.

Warning

This is a class A product. In a domestic environment this product may cause radio interference in which case
the user may be required to take adequate measures.

Note

This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.

Modifications

Any modifications made to this device that are not approved by TOA Corporation may void the authority
granted to the user by the FCC to operate this equipment.

6

5. NOMENCLATURE AND FUNCTIONS

[Front]

1. Power indicator

Lights when the power is switched on.
Tip: The power switch (17) is located on the rear

panel.

2. Sensitivity controls

Adjust the input sensitivity for SENSOR input,
INPUT 1, and INPUT 2.
Factory-setting: 0 dB (center position).

3. SETTING key

Used to set each function. If this key is pressed,
the setting screen is displayed on the LCD screen.

4. METER indication selector key

Indications of channels for which the signal level is
displayed cycle through S (SENSOR level), 1
(Channel 1), and 2 (Channel 2) with each
depression of this key. (See p. 14.)

5. Liquid crystal display

Pressing each function key displays the
corresponding setting screen on this display.
If any key is not used for a specified period of time
while the setting screen is displayed, the ALC and
ANC levels are displayed.

6. PARAMETER/PUSH-ENTER knob

Rotate this knob to change parameters or select
the setting contents on the setting screen.
(Such parameters and setting contents changed
with this knob begin to work in real time.)
To save the current parameters, press this knob
while the setting screen is displayed.

Note

If not saved, newly set parameters are cancelled
when the power is switched off or the RESET key
is pressed. Pressing this knob when the PUSH
ENTER indication is displayed validates the on­screen setting item and saves the current
parameters.

7. BACK key

Returns the setting item display to a previous
screen.

8. NEXT key

Advances the setting item display to a next
screen.

9. ALC key

Permits the ALC function to be set to ON or OFF
by means of the PARAMETER knob (6). If both
this key and the SETTING key (3) are
simultaneously pressed, settings for the ALC
function can be performed.

10. INPUT LEVEL indicator

Indicates the input signal level of the channel
selected with the METER indication selector key
(4). (See p. 14.)

11. ALC LEVEL indicator

Indicates the amount of gain controlled by the
ALC function.

12. MAXIMUM OUTPUT level control

Sets the maximum output level if rotated.

13. ANC key

Permits the ANC function to be set to ON or OFF
by means of the PARAMETER knob (6). If both
this key and the SETTING key (3) are
simultaneously pressed, settings for the ANC
function can be performed.

14. OUTPUT LEVEL indicator

Indicates the output signal level of the channel
selected with the METER indication selector key
(4). (See p. 14.)

15. ANC LEVEL indicator

Indicates the amount of gain controlled by the
ANC function.

16. RESET key

Reactivates the unit.
Tip: Each set data stays stored, and is not

erased.

3

5 6 7

12

1

2

4

8 91011

131415 16

7

[Rear]

17. Power switch

Turns on and off the power.
Tip: The Power indicator (1) is located on the front

panel.

18. AC inlet

Connect this inlet to the AC wall outlet using the
supplied power cord.

19. Functional earth terminal

Hum noise may be generated when external
equipment is connected to the unit. Connecting
this terminal to the functional earth terminal of
the external equipment may reduce the hum
noise.

Note: This terminal is not for protective earth.

20. RS-232C Communication port (Non LPS)

Used for maintenance purposes, and not
normally used.

21. OUTPUT 1 and 2 terminals (+4 dB*, 600Ω)

Electronically-balanced outputs of removable
terminal blocks. Polarity: E=Ground, C=Cold,
H=Hot

Note: Be sure to use the supplied 3P removable

terminal plugs for connection. (See p. 23.)

22. MONITOR OUT terminal (+4 dB*, 600Ω)

Electronically-balanced output of removable
terminal block. Polarity: E=Ground, C=Cold,
H=Hot

Note: Be sure to use the supplied 3P removable

terminal plug for connection. (See p. 23.)

23. INPUT 1 and 2 terminals
(+4/–8/–20 dB* changeable, 15 kΩ)

Electronically-balanced inputs of removable
terminal blocks. Polarity: E=Ground, C=Cold,
H=Hot

Note: Be sure to use the supplied 3P removable

terminal plugs for connection. (See p. 23.)

24. Ground lift switches

When the unit is connected to external
equipment, a ground may create a loop,
potentially generating a hum noise. In such
cases, the ground loop can be cut off by setting
the corresponding switch to the LIFT position.
Normally, set both switches to the NORM
position.

25. SENSOR input terminal
(+4/–48 dB* changeable, 10 kΩ)

Electronically-balanced input of removable
terminal block. Polarity: E=Ground, C=Cold,
H=Hot
Power of 15 V DC/10 mA can be supplied from
the rightmost "+15 V DC" pin terminal.

Note: Be sure to use the supplied 4P removable

terminal plug for connection. (See p. 23.)

26. PHANTOM power switch

Turn on the switch when using a phantom­powered sensor microphone, and the phantom
power of 15 V DC is supplied. Otherwise, when
using other type of sensor microphone or other
equipment, be sure to turn off the switch.

*0 dB = 0.775 V

24

26

17 18 19 20 21 22 23

25

8

6. SETTINGS

6.1. Setting Operations and Setting Screens

6.1.1. Keys and knobs used in settings

(1) SETTING Key

Permits the system setting screen to display. If this key is pressed simultaneously with the ALC key, the
ALC setting screen is displayed. If pressed simultaneously with the ANC key, the ANC setting screen is
displayed.

(2) METER Indication Selector Key

Selects the channel for which the signal level is indicated by the INPUT LEVEL, OUTPUT LEVEL and ALC
LEVEL indicators. The on-screen indication cycles through S (SENSOR level), 1 (Channel 1), and 2
(Channel 2) as the key is pressed.

(3) PARAMETER/PUSH-ENTER Knob

Rotating this knob while [ ] is flashing in the setting screen permits either the setting content or
parameter to be selected. (Such parameters and setting contents changed begin to work in real time.)
Pressing this knob afterward permits [ ] display to disappear, saving the current parameters.
Pressing this knob when the PUSH ENTER indication is displayed validates the on-screen setting item and
saves the current parameters.

(4) BACK Key

Returns the display to a previous screen.

(5) NEXT Key

Advances the display to a next screen.

(6) ALC Key

Permits the ALC function to be set to ON or OFF by rotating the PARAMETER knob. If this key is pressed
simultaneously with the SETTING key, the ALC setting screen is displayed.

(7) ANC Key

Permits the ANC function to be set to ON or OFF by rotating the PARAMETER knob. If this key is pressed
simultaneously with the SETTING key, the ANC setting screen is displayed.

(1)

(7)(3) (4)

(2) (5) (6)

9

6.1.2. On-screen indications

[ALC/ANC level indication screen]

Displayed when in normal operation state.

[Setting screen]

ALC1 0dB METER

ANC 1 OF F S1 2

Indicates ALC and ANC levels or their OFF states.

GAT E LEVEL

INPUT2 –60dB

The signal level of the highlighted channel is displayed by the
INPUT LEVEL, OUTPUT LEVEL, and ALC LEVEL indicators. The
selected channel moves cyclically among S (SENSOR level), 1
(Channel 1), and 2 (Channel 2) as the Meter indication selector
key is pressed.

Appears when there is a previous screen.

Appears when there is a next screen.

Displays the setting content or value.
Varies as the PARAMETER knob is rotated.

INPUTSENSE SET

PUSH ENTER

Displays the setting items.

Press the PUSH-ENTER knob when this indication is displayed.

10

6.2. Setting Flow Charts

6.2.1. System setting flow chart

Adjustment mode

SETTING MODE

N

ORMAL

SUMM

I

NG MODE

O

FF

CHANNEL L I NK

O FF

SETTING MODE

ADVANCED

SUMMING mode

SUMM

I

NG MODE

OUT =CH1 +CH 2

CHANNEL LINK

CHANNEL L I NK

ON

SENSOR input sensitivity

SENSORSENSE

+4dB

SENSORFILTER

FLAT

SYSTEM SE T T I NG

END

After 3 seconds

ALC/ANC level indication screen

ALC1 OFF METER

ANC 1 OF F S 12

SENSOR SENSE

–48dB

SENSOR input characteristics

SENSORFILTER

A

W

EIGHT

11

6.2.2. ALC function setting flow chart

Press both keys simultaneously.

When CHANNEL LINK is
set to OFF.

GAT E LEVE L

INPUT1 –60dB

GAT E LEVE L

INPUT2 –60dB

When CHANNEL LINK is
set to ON.

GAT E LEVE L

When set to NORMAL mode. When set to ADVANCED mode.

INPUTSENSE SET

PUSH ENTER

INPUTSENSE SET

I N PROGRESS. . .

When CHANNEL LINK is
set to OFF.

INPUTSENSE SET

INPUT1 +4dB

–60dB

When CHANNEL LINK is
set to ON.

INPUTSENSE SET

+4dB

INPUTSENSE SET

COMPL ET E

After 3 seconds

INPUTSENSE SET

INPUT2 +4dB

BGMLEVEL

0dB

ALCSETTING

END

After 3 seconds

ALC/ANC level indication screen

ALC1 0dB METER

ANC 1 OF F S 12

12

6.2.3. ANC function setting flow chart

Press both keys simultaneously.

MINNO I SE SET

PUSH ENTER

MINNO I SE SET

I N PROGRESS. . .

MINNO I SE SET

COMPL ET E

MAXLEVEL 0

MIN LEVEL –6

SAMPLETIME

20sec

GA I N RAT I O

N:S = 3 :3

When set to ADVANCED mode.

ADJ .ZERO S: +1

0dB L : –18

SENSING PO I N T

f1 210.0Hz

SENSING PO I N T

f2 550.0Hz

SENSING PO I N T

f3 1.08kHz

ANCSETTING

END

After 3 seconds

ALC/ANC level indication screen

ALC1 OFF METER

ANC 1 0 dB S 1 2

13

6.2.4. ALC and ANC functions ON/OFF settings

[ALC function setting]

[ANC function setting]

ALC CH1 OFF

ALC CH2 OFF

ALC CH1 OFF

ALC CH2 OFF

After 1 minute

ALC/ANC level indication screen

ALC1 0dB METER

ANC 1 OF F S 12

ALC CH1 ON

ALC CH2 OFF

ALC CH1 OFF

ALC CH2 ON

After 3 seconds

ANC CH1 OFF

ANC CH2 OFF

ANC CH1 OFF

ANC CH2 OFF

After 1 minute

ALC/ANC level indication screen

ALC1 OF F METER

ANC 1 0 dB S 1 2

ANC CH1 ON

ANC CH2 OFF

ANC CH1 OFF

ANC CH2 ON

After 3 seconds

14

6.2.5. INPUT LEVEL, OUTPUT LEVEL, and ALC LEVEL indication selection

[Level indicators and indicated channel table]

6.3. Setting Procedures

The general outlines of setting procedures are as shown at right.
If there is a function that is not used, advance to the next procedure
without setting such a function. Ensure that equipment connections
are completed before performing each setting.

Note

Pressing the PUSH-ENTER knob during the setting saves the
current parameters. (Even if the unit's power is switched off and on
again, the set parameters are maintained.)

1. Perform system settings.

2. Set the maximum output level.

3. Set the ALC function.

4. Set the ANC function.

ALC1 OFF METER

ANC 1 0 dB S 12

The cursor moves to the channels S, 1, 2, S, and so on for selection with each
depression of the METER indication selector key.

INPUT LEVEL indicator OUTPUT LEVEL indicator

Selected
channel

S

1

2

ALC LEVEL indicator

INPUT LEVEL indicator

SENSOR level

Channel 1 level

Channel 2 level

ALC LEVEL indicator

Channel 1

Channel 1

Channel 2

ANC LEVEL indicator

Indicators

ANC LEVEL indicator

Channel 1

Channel 1

Channel 2

OUTPUT LEVEL indicator

MONITOR OUT level

Channel 1 level

Channel 2 level

15

[SUMMING mode: OFF] (at CHANNEL LINK: OFF)

[SUMMING mode: ON (OUT=CH1+CH2) ] (at CHANNEL LINK: ON)

Step 1. Perform system settings.

Press the SETTING key to enter the system setting screen
(adjustment mode), then select the setting item with the
PARAMETER knob. (See p. 10; System setting flow chart.)

1-1. Set the adjustment mode.

Setting parameter: NORMAL or ADVANCED

The ADVANCED mode has more manually-operated setting
items than the NORMAL mode, enabling fine settings.

1-2. Set the SUMMING mode.

Setting parameter: OFF or OUT = CH1+CH2

The diagrams below show the relationship between the
input/output and the ALC/ANC functions when the
SUMMING mode is ON (OUT = CH1+CH2) and that when
the SUMMING mode is OFF.

1-3. Set the CHANNEL LINK.

Setting parameter: ON or OFF

Setting the CHANNEL LINK to ON permits both CH1 and
CH2 to be linked for each ON/OFF setting of the ALC and
ANC functions.
In this case, the input levels on CH1 and CH2 are ALC­controlled at the same level.

[CHANNEL LINK: OFF] (at SUMMING mode: OFF)

[CHANNEL LINK: ON] (at SUMMING mode: OFF)

1-4. Set the SENSOR input sensitivity.

Setting parameter: +4 dB or –48 dB

1-5. Set the SENSOR input characteristics.

Setting parameter: A WEIGHT (A-weighted filter) or FLAT

[Enter the setting screen.]

INPUT1

INPUT2

ALC

ANC

ALC

OUTPUT1

OUTPUT2

INPUT1

INPUT2

ALC

ANC

ALC

OUTPUT1

OUTPUT2

SETTING MODE

NORMAL

SUMMING MODE

OFF

CHANNEL L I NK

O FF

ALC CH1's switch ANC CH1's switch

INPUT1

INPUT2

ALC CH2's switch ANC CH2's switch

ALC

ALC

ANC

OUTPUT1

OUTPUT2

INPUT1

INPUT2

LINK

ALC

ANC

LINK

OUTPUT1

OUTPUT2

SENSORSENSE

+4dB

SENSORFILTER

A

W

EIGHT

Step 2. Set the maximum output level.

Check the maximum input level of the equipment connected to
the unit's OUTPUT 1 and OUTPUT 2, then adjust it to the
appropriate level with the MAXIMUM OUTPUT level control.

Tip

Both the OUTPUT 1 and OUTPUT 2 are set to the same level.

Step 3. Set the ALC function.

The setting item differs depending on the adjustment mode
(NORMAL or ADVANCED) and CHANNEL LINK (OFF or ON).
To set, press both the SETTING key and the ALC key
simultaneously to enter the setting screen, then select the
setting value with the PARAMETER knob.
(See p. 11; ALC function setting flow chart.)

When the adjustment mode is set to NORMAL, and CHANNEL LINK to OFF:

Connect a sound source to INPUT 1.
When INPUT 2 is used in the setting step below, also connect a sound source to INPUT 2.

3-1. Set the GATE LEVEL of INPUT 1 while monitoring the INPUT

LEVEL indicator.

When the input level is below the GATE LEVEL, the ALC level
is kept unchanged.
When it is above the GATE LEVEL, the ALC function works to
change the controlled variable.

3-2. Set the GATE LEVEL of INPUT 2 while monitoring the INPUT

LEVEL indicator.

When the input level is below the GATE LEVEL, the ALC level
is kept unchanged.
When it is above the GATE LEVEL, the ALC function works to
change the controlled variable.

3-3. Press the PUSH-ENTER knob.

The sensitivity of INPUT 1 and INPUT 2 is automatically
adjusted to +4,–8, or –20 dB depending on the input level.

3-4. Adjust the BGM broadcast level.

Perform this step when the INPUT 1 is used for announcement
and the INPUT 2 is for BGM, and when BGM is desired to be
broadcast in smaller volume than announcement.
The BGM LEVEL to be set here is the attenuation level to the
announcement level.
For example, when BGM is broadcast 6 dB smaller than
announcement in volume, set the BGM LEVEL to –6 dB.

16

MAX IMUM OU TP U T

[Enter the setting screen.]

Press both keys simultaneously.

0dB

u

GAT E LEVE L

INPUT1 –60dB

GAT E LEVE L

INPUT2 –60dB

INPUTSENSE SET

PUSH ENTER

BGMLEVEL

0dB

17

When the adjustment mode is set to NORMAL, and CHANNEL LINK to ON:

Connect a sound source to INPUT 1.
When INPUT 2 is used in the setting step below, also connect a sound source to INPUT 2.

3-1. Set the GATE LEVEL while monitoring the INPUT LEVEL

indicator.

Both the INPUT 1 and INPUT 2 are set to the same level.
When the input level is below the GATE LEVEL, the ALC level
is kept unchanged.
When it is above the GATE LEVEL, the ALC function works to
change the controlled variable.

3-2. Press the PUSH-ENTER knob.

Input sensitivity is automatically adjusted to +4, –8, or –20 dB
depending on the input level.
Both the INPUT 1 and INPUT 2 are set to the same level.

3-3. Adjust the BGM broadcast level.

Perform this step when the INPUT 1 is used for announcement
and the INPUT 2 is for BGM, and when BGM is desired to be
broadcast in smaller volume than announcement.
The BGM LEVEL to be set here is the attenuation level to the
announcement level.
For example, when BGM is broadcast 6 dB smaller than
announcement in volume, set the BGM LEVEL to –6 dB.

When the adjustment mode is set to ADVANCED, and CHANNEL LINK to OFF:

Connect a sound source to INPUT 1.
When INPUT 2 is used in the setting step below, also connect a sound source to INPUT 2.

3-1. Set the GATE LEVEL of INPUT 1 while monitoring the INPUT

LEVEL indicator.

When the input level is below the GATE LEVEL, the ALC level
is kept unchanged.
When it is above the GATE LEVEL, the ALC function works to
change the controlled variable.

3-2. Set the GATE LEVEL of INPUT 2 while monitoring the INPUT

LEVEL indicator.

When the input level is below the GATE LEVEL, the ALC level
is kept unchanged.
When it is above the GATE LEVEL, the ALC function works to
change the controlled variable.

3-3. Set the input sensitivity of INPUT 1 to +4, –8, or –20 dB

depending on the input level.

3-4. Set the input sensitivity of INPUT 2 to +4, –8, or –20 dB

depending on the input level.

3-5. Adjust the BGM broadcast level.

Perform this step when the INPUT 1 is used for announcement
and the INPUT 2 is for BGM, and when BGM is desired to be
broadcast in smaller volume than announcement.
The BGM LEVEL to be set here is the attenuation level to the
announcement level.
For example, when BGM is broadcast 6 dB smaller than
announcement in volume, set the BGM LEVEL to –6 dB.

GAT E LEVE L

–60dB

INPUTSENSE SET

PUSH ENTER

BGMLEVEL

GAT E LEVE L

INPUT1 –60dB

0dB

GAT E LEVE L

INPUT2 –60dB

INPUTSENSE SET

INPUT1 +4dB

INPUTSENSE SET

INPUT2 +4dB

BGMLEVEL

0dB

4-1. Set the reference value of SENSOR level.

Perform this setting in the quietest circumstance.
If the PUSH-ENTER knob is pressed while the screen at right is
displayed, the ambient noise level is automatically measured
for 15 seconds.

Note

Do not input the sound source in this procedure.

4-2. Adjust the maximum output level.

Connect a sound source to INPUT 1 and adjust the level while
monitoring the output sound.
Adjustable range: (MIN LEVEL +3) to 0 dB

4-3. Adjust the minimum output level.

Connect a sound source to INPUT 1 and adjust the level while
monitoring the output sound.
Adjustable range: –18 to (MAX LEVEL –3) dB

Step 4. Set the ANC function.

To set, press both the SETTING key and the ANC key
simultaneously to enter the setting screen, then select the
setting value with the PARAMETER knob.
(See p. 12; ANC function setting flow chart.)

18

When the adjustment mode is set to ADVANCED, and CHANNEL LINK to ON:

Connect a sound source to INPUT 1.
When INPUT 2 is used in the setting step below, also connect a sound source to INPUT 2.

3-1. Set the GATE LEVEL while monitoring the INPUT LEVEL

indicator.

Both the INPUT 1 and INPUT 2 are set to the same level.
When the input level is below the GATE LEVEL, the ALC level
is kept unchanged.
When it is above the GATE LEVEL, the ALC function works to
change the controlled variable.

3-2. Set the input sensitivity to +4, –8, or –20 dB depending on the

input level.

Both the INPUT 1 and INPUT 2 are set to the same level.

3-3. Adjust the BGM broadcast level.

Perform this step when the INPUT 1 is used for announcement
and the INPUT 2 is for BGM, and when BGM is desired to be
broadcast in smaller volume than announcement.
The BGM LEVEL to be set here is the attenuation level to the
announcement level.
For example, when BGM is broadcast 6 dB smaller than
announcement in volume, set the BGM LEVEL to –6 dB.

GAT E LEVE L

–60dB

INPUTSENSE SET

+4dB

BGMLEVEL

0dB

[Enter the setting screen.]

Push both keys simultaneously.

MINNO I SE SET

PUSH ENTER

After 15 seconds

MAXLEVEL 0

MIN LEVEL –6

MAXLEVEL 0

MIN LEVEL –6

To the next page

4-4. Set the average time required to detect the ambient noise

levels with the sensor microphone.

Adjustable range: 10 s, 20 s, 30 s, 1 min, 5 min

4-5. Adjust the ratio of ambient noise level variation to output level

variation.

For example, if the ratio between N and S is set to be 3:3, the
output volume level goes up by 3 dB when the ambient noise
level increases by 3dB.
Adjustable range: 6:3, 5:3, 4:3, 3:3, 3:4, 3:5, 3:6

When the adjustment mode is set to ADVANCED:
4-6. Finely adjust the reference value (ZERO level) of the set

SENSOR level.

If the reference value* differs from the actual minimum noise
level, there may be a situation that the output sound is
extremely loud though the ambient noise is quiet.
In such cases, correct the reference value of SENSOR level.

* The minimum noise level that has been measured in Step 4-1

is defined as reference value "ZERO level."

The explanations below are based on the assumption that the maximum output level (MAX LEVEL),
minimum output level (MIN LEVEL), and gain ratio (GAIN RATIO) are as follows: MAX LEVEL = 0 dB,
MIN LEVEL = –12 dB, and GAIN RATIO = 3:3.

[When the preset minimum ambient noise level is the same as the actual level]

No correction is needed.
The diagram below shows the relationship among the ambient noise level, SENSOR level, and output
level.

19

From the previous page

SAMPLETIME

20sec

GA I N RAT I O

N:S = 3 :3

ADJ .ZERO S: +1

0dB L : –18

To page 21

0

80 dB

Noise range in which you desire
to control the output level.

68 dB

dB

11
10

–3
9
8
7

–6
6
5
4

–9
3
2
1

–12

0

The output level is properly adjusted in response
to changes in ambient noise level.

ZERO level set by following MIN NOISE SET
instruction (Step 4-1)

Ambient noise level

Output level

SENSOR level

20

[When the preset minimum ambient noise level is extremely lower than the actual level]

In this case, the unit recognizes that the ambient noise is high even in low ambient noise condition (A) where
the unit is actually used, providing sound output at high level (–3 dB in this example).

Correct the ZERO level to a higher level to obtain the optimum operation according to the cases (1) and (2)
below.

(1) If the current noise level (A) is the minimum ambient noise level when the unit is actually used, increase

the ZERO level so that the SENSOR level (S) becomes "0."

SENSOR level

80 dB

ADJ .ZERO S: +1 0

0dB L : –3

Noise range in which you desire
to control the output level.

Current noise level (A)

Ambient noise level

68 dB

0

dB

11
10

–3
9
8
7

–6
6
5
4

–9
3
2
1

–12

0

Adjusted output level

ZERO level set by following MIN NOISE SET
instruction (Step 4-1)

ZERO level correction value

Output level

Output level

SENSOR level

Noise range in which you desire
to control the output level.

Current noise level (A)

Ambient noise level

80 dB

68 dB

11
10

9
8
7
6
5
4
3
2
1

–12

0

SENSOR level

0

dB

–3

–6

–9

ADJ .ZERO S: 0

+10dB L:–12

ZERO level correction value

SENSOR level

Output level

Adjusted output level

Correct the ZERO level to this position.

+10 dB

Increase

ZERO level set by following MIN NOISE SET
instruction (Step 4-1)

Output level

21

4-7. Set the ambient noise frequency to be measured.

If the frequency to be measured is known, set the SENSING
POINT displayed on the screen to that frequency.
If not known, leave the default frequencies unchanged.

-------- Reference ---------------------------------------------------------------

[Default frequency] [Settable frequency range: 20 Hz to 20 kHz]

f1 = 210 Hz Where, f1 < f2 < f3
f2 = 550 Hz f2 - f1 ≥ 30 Hz
f3 = 1.08 kHz f3 - f2 ≥ 30 Hz

(2) If the current noise level (A) is not the minimum ambient noise level when the unit is actually used, correct

the ZERO level so that the output level becomes the desired level.

[When the preset minimum ambient noise level is extremely higher than the actual level]

Correct the ZERO level to a lower level to obtain the optimum operation.

6.4. Key Lock Function Settings

All front panel-mounted keys and knobs can be locked.
When the key lock operation is performed, the set parameters are stored in the unit.

6.4.1. Locking the keys

6.4.2. Releasing the locked state

SENSOR level

ADJ .ZERO S: +6

+10dB L: –6

Output level

Desired

ZERO level correction value

output level

Correct the ZERO level to this position.

+10 dB

Increase

Noise range in which you desire
to control the output level.

Current noise level (A)

80 dB

68 dB

0

dB

11
10

–3
9
8
7

–6
6
5
4

–9
3
2
1

–12

0

ZERO level set by following MIN NOISE SET
instruction (Step 4-1)

Ambient noise level

Output level

SENSOR level

From page 19

SENSING PO I N T

f1 210 . 0Hz

Frequencies f2 and f3 can be set
in the similar manner.

Hold down the SETTING key for 5 seconds. When locked keys are operated:

KEYLOCKED KEYLOCK I NG

Hold down the SETTING key for 5 seconds.

KEYUNLOCKED

22

6.5. Restoring Default Settings

Following 2 methods are available to revert the unit's current settings to the factory-preset parameters.

(1) Method by using the power switch

Step 1. Turn the power switch off.

Step 2. Turn the power switch on while holding down both the

BACK key and NEXT key at the same time.

Note

Keep pressing both the BACK key and NEXT key till the indication "RELEASE KEYS" appears on the
LCD screen.

(2) Method by using the RESET key

Press the RESET key while holding down both the BACK key and NEXT key at the same time.

Note

Keep pressing both the BACK key and NEXT key till the indication "RELEASE KEYS" appears on the LCD
screen.

[Front]

Liquid crystal display BACK key

NEXT key RESET key

[Rear]

Power switch

23

7. CONNECTIONS

Be sure to use the supplied removable terminal plugs (3P, 4P) for connections to the removable terminal
blocks.

7.1. Removable Terminal Plug Connection

Cautions

• Be sure to use shielded cables for audio signal lines.

• Avoid soldering stranded or shielded cable, as contact resistance may increase when the cable is tightened
and the solder is crushed, possibly resulting in an excessive rise in joint temperatures.

Cable end treatment

Connector connections

Step 1. Loosen the terminal screw, then insert

the cable.

Step 2. Retighten the terminal screw. (Pull on

the cable to ensure it is securely
connected.)

Step 3. Mount the removable terminal plug to

the unit.

Tip

Recommended slotted screwdriver type: Screwdriver with 3 mm blade width

Solid or stranded cable Shielded cable

7 mm

7 mm

20 mm

Slotted screwdriver

2

Tightens Loosens

Shielded cable

3 mmBit shape

Terminal screw

1

DP-L2's
rear panel

1

3

Removable
terminal block

Removable terminal plug
(accessory)

24

7.3. Example 2: Input and Output Connections

(When Connecting to a BGM Player's Outputs)

7.2. Example 1: Input and Output Connections

(When Connecting to a Stereo Mixer's Outputs)

DP-L2

POWER

Speaker

Power amplifier Speaker

PROTECT PEAK

SIGNAL

PROTECTPEAK

SIGNAL

VR BYPASS

VR BYPASS

CH 1

CH 2

POWER

16

16

1419

1419

1222

1222

1025

1025

828

828

632

632

438

438

345

345

254

254

166

166

0

– dB

0

– dB

Sensor microphone

(for detecting
ambient noise)

SIGNAL

GND

RS-232C

ON

OUTPUT 2 [+4dB]

CEH

OUTPUT 1 [+4dB]

CEH

MONITOR OUT

CEH

[+4dB]

INPUT 2 [+4/–8/–20dB]

CEH

GND
LIFT

INPUT 1 [+4/–8/–20dB]

NORM

CEH

SENSOR [+4/–48dB]

CEH

+15VDC

NORM

GND

LIFT

OFF

PHANTOM

ON

Power amplifier

PROTECT PEAK

SIGNAL

PROTECTPEAK

SIGNAL

VR BYPASS

VR BYPASS

CH 1

CH 2

POWER

16

16

1419

1419

1222

1222

1025

1025

828

828

632

632

438

438

345

345

254

254

166

166

0

– dB

0

– dB

BGM ANNOUNCE

Stereo mixer

INPUT

Microphones

BGM player

BGM player

Power amplifier

PROTECT PEAK

SIGNAL

PROTECTPEAK

SIGNAL

VR BYPASS

VR BYPASS

CH 1

CH 2

POWER

16

16

1419

1419

1222

1222

1025

1025

828

828

632

632

438

438

345

345

254

254

166

166

0

0

DP-L2

POWER

ON

Speaker

RS-232C

SIGNAL

GND

Power amplifier

PROTECT PEAK

SIGNAL

VR BYPASS

CH 1

16

1419

1222

1025

166

0

OUTPUT 2 [+4dB]

POWER

828

632

438

345

254

SIGNAL

CH 2

CEH

PROTECTPEAK

VR BYPASS

16

1419

1222

1025

828

254

166

0

OUTPUT 1 [+4dB]

CEH

632

438

345

MONITOR OUT

CEH

[+4dB]

INPUT 2 [+4/–8/–20dB]

CEH

GND
LIFT

BGM player

Speaker

INPUT 1 [+4/–8/–20dB]

NORM

CEH

Sensor microphone

(for detecting
ambient noise)

SENSOR [+4/–48dB]

CEH

+15VDC

NORM

GND
LIFT

OFF

PHANTOM

ON

25

8. RACK MOUNTING

Notes

• Install the unit in locations where the temperature is between 0 and +40°C and the moisture is less than 90%

(no dew condensation must be formed).

• When mounting the DP-L2 in an equipment rack, ensure good ventilation by removing all of the panels

located on the rear of the rack. Also, be sure to mount a perforated panel larger than 1U size at the top and
bottom of the rack.

• When mounting two DP-L2 units in an equipment rack, be sure also to mount a perforated panel larger than

1U size above and below the two units, as shown in the figure.

• When rack-mounting the DP-L2 close to a power amplifier or other heat-generating equipment, be sure to

mount the unit below the equipment so that it is not affected by the rising heat.

When installing the unit in an equipment rack, do not to block the ventilation slots on the unit's sides
and rear.
Doing so may cause heat to build up inside the unit and result in fire.

CAUTION

Lors de l'installation de l'appareil en bâti, veiller à ne pas obstruer les évents de ventilation sur les
côtés et l'arrière sous peine de provoquer une accumulation de chaleur à l'intérieur de l'appareil,
pouvant aboutir à un incendie.

ATTENTION

Equipment rack

Power amplifier

Perforated panel

DP-L2

DP-L2

Rack-mounting screw

Note

As no rack-mounting screws are supplied,
prepare locally the screws appropriate for the rack.

26

9. BLOCK DIAGRAM

MONITOR

OUT

(+4 dB*)

E

H

C

H

OUTPUT 1

(+4 dB*)

E

C

H

OUTPUT 2

(+4 dB*)

E

C

* 0 dB=0.775 V

A/D D/A

SENSOR C

SENSOR H

– ∞ ~ +12 dB

At power OFF

LA

D/A

DSP

A/D

INPUT 1 C

INPUT 1 H

– ∞ ~ +12 dB

At power OFF

LA

D/A

A/D

INPUT 2 C

INPUT 2 H

– ∞ ~ +12 dB

At power OFF

Key/Rotary Encoder/Rotary Switch

LCD Display

CPU

Level Meter

ALC/ANC STATUS

+15 V

+15 V

HA LA

Phantom

Power

H

C

SENSOR

+4/–48 dB*

SENSOR C

SENSOR H

At power OFF

E

HA

H

INPUT 1 C

INPUT 1 H

E

C

INPUT 1

+4/–8/–20 dB*

At power OFF

GND LIFT

HA

H

INPUT 2 C

E

C

INPUT 2

+4/–8/–20 dB*

INPUT 2 H

At power OFF

GND LIFT

27

Setting content

NORMAL ADVANCED

OFF OUT=CH1+CH2

OFF ON

+4 dB

-

48 dB

FLAT A WEIGHT

dB

dB

dB

dB

-

20

-

8 +4 dB

-

20

-

8 +4 dB

dB

---------

:

:

dB

Hz

Hz

Hz

10. RECORDING TABLE OF FUNCTION SETTINGS

It is recommended that you note the current setting contents in this recording table for future reference.

Function

SETTING

ALC

ANC

Mode*

C

C

A + C

A + C

A

A

A

A

Setting item

SETTING MODE

SUMMING MODE

CHANNEL LINK

SENSOR SENSE

SENSOR FILTER

GATE LEVEL

INPUT 1

INPUT 2

INPUT SENSE SET

INPUT 1

INPUT 2

BGM LEVEL

MIN NOISE SET

MAX LEVEL

MIN LEVEL

SAMPLE TIME

GAIN RATIO

ADJ. ZERO

SENSING POINT f1

SENSING POINT f2

SENSING POINT f3

Default (presetting)

NORMAL

OFF

OFF

+4 dB

A WEIGHT

-

60 dB

-

60 dB

-

60 dB

AUTO

+4 dB

+4 dB

0 dB

AUTO

0

-

6

0 : 20

3 : 3

0 dB

210.0 Hz

550.0 Hz

1.08 kHz

* Blank: NORMAL mode

A: ADVANCED mode
C: CHANNEL LINK

CU version: 110 – 120 V AC, 50/60 Hz
CE/CE301/CE-GB/315H version: 220 – 240 V AC, 50/60 Hz
CU version: 20 W, 300 mA
CE/CE301/CE-GB/315H version: 20 W, 220 mA
20 Hz – 20 kHz (±1 dB)
48 kHz
Over 108 dB (IHF-A weighted)
Under 0.006%, 1 kHz, +4 dB* input/output (20 Hz – 20 kHz BPF)
Sensor input (Ambient noise sensor microphone input):

+4/–48 dB* changeable, 10 kΩ, electronically-balanced, removable
terminal block (4 pins), phantom power (+15 V DC, can be turned on or
off with Phantom switch) with +15 V DC terminal

Input 1, 2: +4/–8/–20 dB* changeable, 15 kΩ, electronically-balanced, removable

terminal block (3 pins)

Monitor output: +4 dB*, 600 Ω, electronically-balanced, removable terminal block (3 pins)
Output 1, 2: +4 dB*, 600 Ω, electronically-balanced, removable terminal block (3 pins)
24 bit
24 bit
Automatic level control function:
Level meter (4 LED meters), Automatic input signal level control function,
Automatic input sensitivity setting function (+4/–8/–20 dB*), Noise gate level
setting (–99 to –3 dB)
Ambient noise control function:
Level meter (4 LED meters), BGM/Announce level control function, Automatic
sensor input reference level measuring function, Sensor input reference level
fine adjustment function, Maximum output signal level control (–15 to 0 dB),
Minimum output signal level control (–18 to –3 dB), Sample time setting (10 s, 20
s, 30 s, 1 min, 5 min), Gain ratio setting (6:3, 5:3, 4:3, 3:3, 3:4, 3:5, 3:6), Ambient
noise measuring frequency setting (20 Hz – 20 kHz, 3 points)
Maximum output signal level control function: –12, –6, 0, +4, +6, +12, +18, +24 dB*
Input level indicator: 8 LEDs indicator
Output level indicator: 8 LEDs indicator
Phantom power switch (sensor input), Ground lift switch (INPUT 1, INPUT 2),
Key lock function, Input/Output bypass function in power off
0 to 40 °C
Under 90% RH (no condensation)
Pre-coated steel plate, black, 30% gloss
482 (w) x 44 (h) x 303 (d) mm

3.7 kg

* 0 dB = 0.775 V

Note

• The design and specifications are subject to change without notice for improvement.

• Prepare locally the sensor microphone for detecting ambient noise.

• Accessories

Power cord (2 m) .................................................................... 1

Removable terminal block (3 pins) .......................................... 5

Removable terminal block (4 pins) .......................................... 1

11. SPECIFICATIONS

Power Source

Power Consumption

Frequency Response
Sampling Frequency
Dynamic Range
Distortion
Input

Output

A/D Converter
D/A Converter
Signal Processing

Other Feature

Operating Temperature
Operating Humidity
Finish
Dimensions
Weight

133-02-00048-00

URL: http://www.toa.jp/